This disambiguation page lists articles associated with the title UPD. If an internal link led you here, you may wish to change the link to point directly to the intended article.
Chronic smokers often have difficulty breathing because they develop Chronic Obstructive Pulmonary Disorder, or COPD. The two diseases that fall under that category are emphys â¦ ema and chronic bronchitis.
An incurable, progressive disease, COPD is associated with smoking and is the third-leading cause of death in the United States, the researchers added. Smokers who have 'normal' lung-function tests often have significant respiratory disease.ealthDay Reporter. MONDAY, June 22, 2015 (HealthDay News) -- Millions of long-term smokers may have undiagnosed lung disease, a new study finds. Fifty-five percent of those who pass lung function tests still have a respiratory impairment, researchers report.